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from nitrate media; Comparison with a conventional organic phosphateUeda, Yuki; Kikuchi, Kei*; Tokunaga, Kohei; Sugita, Tsuyoshi; Aoyagi, Noboru; Tanaka, Kazuya; Okamura, Hiroyuki
Solvent Extraction and Ion Exchange, 39(5-6), p.491 - 511, 2021/00
Times Cited Count：0 Percentile：0(Chemistry, Multidisciplinary)no abstracts in English
solution; Comparison with tri-
-butyl phosphateUeda, Yuki; Kikuchi, Kei; Sugita, Tsuyoshi; Motokawa, Ryuhei
Solvent Extraction and Ion Exchange, 37(5), p.347 - 359, 2019/07
Times Cited Count：8 Percentile：34.18(Chemistry, Multidisciplinary)We have newly-designed fluorous phosphate(TFP) for the effective Zr(IV) ion extractant as an alternative extractant against the conventional organic phosphate, tri--butyl phosphate(TBP). Zr(IV) ion extraction system using the TBP has many problems such as the formation of the third phase during liquid-liquid extraction. Here, we develop the fluorous extraction system based on the TFP-perfluorohexane for the Zr(IV) ion extraction to improve the Zr(IV) ion extraction system with an effective extractability and without the third phase formation. Our main findings were that the significant high extraction performance of the TFP for Zr(IV) ion as compared with TBP, and the origins of the high extraction performance of the TFP are related to the water and HNO contents in the fluorous phase and the stability of the complex, Zr(No)
(TFP).
solution; Comparison with tri--butyl phosphateUeda, Yuki; Kikuchi, Kei; Sugita, Tsuyoshi; Tokunaga, Kohei; Motokawa, Ryuhei; Naganawa, Hirochika
no journal, ,
The extraction and separation of Zr(IV) as a major fission product from aqueous HNO solutions have been investigated extensively because the presence of Zr in the TBP-based PUREX process for reprocessing spent nuclear fuel is problematic. Moreover, the formation of liquid-liquid (water, oil) interfacial cruds or a third phase during Zr extraction by TBP from HNO aqueous solution occurs with a high metal loading in the organic phase. In this study, we develop a fluoroalkylated phosphate (TFP) for Zr(IV) extraction to increase the extractability and prevent third-phase formation. We investigated the extraction performance and mechanism of TFP extraction of Zr(IV) from HNO solutions into perfluorohexane and compared them with the conventional organic extraction system using TBP in n-octane. The Zr(IV) extraction strength of TFP in the fluorinated diluent perfluorohexane was much higher than that of TBP in n-octane.
Kikuchi, Kei; Ueda, Yuki; Sugita, Tsuyoshi; Naganawa, Hirochika
no journal, ,
Fluorous solvents, such as perfluorinated alkanes, ethers, and tertiary amines have excellent chemical properties, including low toxicity, low viscosity, nonflammability, chemical stability, and immiscibility with both water and organic solutions. However, there are few reports on metal ion extraction in fluorous biphasic systems, because hardly any extractants that have a high affinity for fluorous solvents and the introduction of fluorous groups can reduce the extraction performance. In this study, a fluorous extractant with a sufficiently long spacer between the coordinating group and fluoroalkyl chain can maintain the original coordinating ability, which is comparable with a conventional organic extractant, and have an affinity for the fluorous solvent. We investigated the extraction performance and mechanism of TFP extraction of Zr(IV) from HNO solutions into perfluorohexane and compared them with the conventional organic extraction system using TBP in n-octane.
